Method for diagnosing immunoglobulin A nephropathy and TGBM nephropathy

ABSTRACT

A protein used as a biomarker for diagnosing IgA nephropathy and TGBM (thin-glomerular-basement-membrane) using urine through a target proteomics method. A diagnosis biomarker protein and a kit for diagnosing IgA nephropathy and TGBM and predicting progress of the nephropathy in advance using the protein are provided. The degree of the progression of the disease can be grasped by detecting IgA nephropathy and TGBM, enabling early diagnosis and confirming progress from the patient&#39;s urine. In addition, a monoclonal antibody produced based on the diagnosis biomarker protein can be used for an immunoassay kit (ELISA, antibody coated tube test, lateral-flow test, potable biosensor). The monoclonal antibody is used in early diagnosis and progression detection of IgA nephropathy and development of a novel drug for the purpose of treatment.

CROSS REFERENCE TO RELATED APPLICATION

This application is a 35 U.S.C. 371 National Phase Entry Application from PCT/KR2009/005589, filed Sep. 30, 2009, which claims the benefit of Korean Patent Application No. 10-2008-0096862 filed on Oct. 1, 2008, the disclosure of which is incorporated herein in its entirety by reference.

TECHNICAL FIELD

The present invention relates to development of a protein that can be used for diagnosing IgA nephropathy and thin-glomerular-basement-membrane (hereinafter, referred to as “TGBM”) nephropathy, and used as a biomarker for diagnosing serious cases thereof, and more particularly to a biomarker protein that shows increased/decreased levels in urine of IgA nephropathy patients or TGBM nephropathy patients compared to those in urine of normal people, and a diagnostic kit using the biomarker protein, which can be used to diagnose IgA nephropathy and TGBM nephropathy early, and predict and determine the degree of progression of the disease in advance.

BACKGROUND ART

IgA nephropathy is one of the various diagnoses of glomerulonephritis, and is known to be the most frequent glomerulonephritis in foreign countries as well as Korea. Its cause is not well known. When bacteria invade a body, an immunity substance referred to as an “antibody” is required to struggle against the bacteria. However, a phenomenon in which immunoglobulin A (IgA), one of such antibodies, reaches a kidney's glomerulus and destroys it without struggling against bacteria is referred to as IgA nephropathy. At present, the representative biomarkers for determining the degree of progression of IgA nephropathy include proteinuria and creatine. However, proteinuria is highly related to a marker for other diseases in that it is also a marker indicating occurrence of hypertension and cardiovascular diseases as well as IgA nephropathy, and thus it is difficult to directly determine the degree of progression of diabetic nephropathy. Also, TGBM nephropathy causes symptoms such as haematuria and proteinuria. Although such symptoms are similar to those of IgA nephropathy, TGBM nephropathy is a disease with a relatively favorable prognosis. However, it is impossible to accurately diagnose IgA nephropathy by only such a history (including a cause, symptoms, and progress with the passage of time, etc. of a patient's disease), and a kidney biopsy is required for accurate diagnosis.

Accordingly, when a novel diagnosis marker having clinically high specificity and sensitivity, and a monoclonal antibody for detecting the marker are developed, it is possible to develop a kit which can diagnose diabetic nephropathy early and the degree of progression can be predicted in advance.

Accordingly, the present inventors attempted to conduct research for overcoming problems of the above described conventional technologies. As a result, they have completed the present invention by identifying biomarkers of diseases such as IgA nephropathy and TGBM nephropathy through a target proteomics technique.

IgA nephropathy is the most frequent glomerulonephritis in Korea. It may occur in all age groups, but mainly occurs in people in their teens and twenties. Its clinical features are various. Intermittent visible haematuria may occur accompanied by upper respiratory tract infection, or persistent microscopic haematuria and proteinuria occur. In some cases, IgA nephropathy is expressed as nephritic syndrome, acute nephritis, or hypertension. Also, in many cases, IgA nephropathy progresses while being unknown to patients, and then is found as chronic renal failure. It has been reported that IgA nephropathy is slowly progresses, and finally progresses to a terminal kidney disease in about 30% or more of patients within 20 years. However, IgA nephropathy shows various clinical progresses. Known risk factors that have an effect on prognosis include persistent proteinuria, depression in renal function, persistent hypertension, old age, being male, and histological findings, etc. IgA nephropathy is a kind of immune complex-mediated glomerular disease. Its basic cause is a control disorder of an immune reaction against an antigen coming into a mucous membrane, etc., by which polymeric IgA1 is excessively produced in bone marrow, and at the same time the structure deficiency of IgA1 occurs. As a result, polymeric IgA1 is deposited in mesangium, and damage is caused by mediators. Optical microscopic findings on IgA nephropathy characteristically include focal or diffuse cell proliferation, and expansion of extracellular matrix in mesangium. The cell proliferation occurs in various ways and even causes crescent formation. Vascular lesion and tubulointerstitial lesion are also observed. Immunofluorescence is necessary for a diagnosis of IgA nephropathy because it shows that IgA is significantly deposited in mesangium. In general, IgA is deposited together with C3, IgG, IgM, etc. Electron microscopic findings are characterized in that high electron dense deposits are observed in mesangium or its periphery, and subendothelial deposits are locally observed in the periphery of the mesangium.

There are patent disclosures concerning research on a diagnosis method of IgA nephropathy. Korean laid-open patent No. 1999-82292 discloses a method of obtaining a novel gene from an IgA renopathy patient's leukocytes by using a differential•display method, an IgA nephropathy diagnostic agent including oligonucleotide derived from a leukocyte, and a therapeutic agent. Korean registered patent No. 528664 discloses an IgA protein for diagnosing diabetic retinopathy, a diagnostic kit including an IgA protein antibody, and a diagnosis method. Korean laid-open patent No. 2004-54609 discloses a method for relating a gene expression profile to a protein expression profile in identifying a target protein related to a disease such as an autoimmune disease to identify new drug development and a diagnosis marker. US patent publication No. 2007/87448 discloses a general method for diagnosing the progress stage of a disease by collecting a physiological specimen from blood and urine of a subject, obtaining a spectroscopic peak through the mass spectrometry of the specimen, and using protein profile analysis information obtained from the peak. Korean registered patent No. 792630 discloses a method for early diagnosis and progress stage determination of diabetic nephropathy in diabetes mellitus, in which the occurrence, early diagnosis, progress stage, and symptom severity of diabetic nephropathy in diabetes mellitus are determined from blood of a person, and a monoclonal antibody prepared based on an identified protein is used for an immunoassay kit.

Although it is important to diagnose early and treat IgA nephropathy or TGBM nephropathy before serious depression in renal function occurs in IgA nephropathy patients or TGBM nephropathy patients, it is difficult to determine whether to carry out an invasive test such as renal biopsy in young adults showing only hematuria or proteinuria without symptoms in order to diagnose the nephropathy. Furthermore, in a case of renal biopsy, it is difficult to actually carry out the biopsy in all patients for various reasons. Therefore, there is a need to develop a novel method or kit for diagnosing IgA nephropathy or TGBM nephropathy, which is simple and accurate.

DISCLOSURE Technical Problem

Therefore, the present invention has been made in view of the above-mentioned problems and requirements, and a principle object of the present invention is to provide a novel biomarker protein or an immunogenic fragment thereof, which can be used to diagnose IgA nephropathy and TGBM nephropathy early, and their degrees of progression can be effectively detected.

Another object of the present invention is to provide an antibody against the biomarker protein, and a composition and a diagnostic kit which use the same.

Technical Solution

In accordance with an aspect of the present invention, a biomarker for diagnosing IgA nephropathy and TGBM nephropathy, which includes, as an active component, proteins selected from the group including proteins increased/decreased levels in urine of nephropathy subjects compared to those levels in urine of normal people is provided. In order to obtain a diagnosis biomarker protein, label-free quantification was used. For convenience of analysis and reproducibility, all nephropathy patient groups subjected to tests in the Examples, i.e., both the group of IgA nephropathy patients (hereinafter, referred to as a “IgAN group”), and the group of TGBM patients (hereinafter, referred to as a “TGBM group”) were limited to only teenagers. Also, instead of all proteins in patients' urine, only exosomes within the urine were separated and used for the tests in the Examples.

In the present invention, a subject means an IgA nephropathy patient or a TGBM nephropathy patient, and an immunogenic fragment means a fragment of biomarker protein which has at least one epitope recognizable by the antibody against the biomarker protein of the present invention.

In another aspect of the present invention, the present invention provides a diagnostic agent for IgA nephropathy and/or TGBM nephropathy, which includes, as an active component, an antibody that is specifically bound to the biomarker protein of the present invention or the immunogenic fragment thereof. The antibody of the present invention may be a polyclonal antibody, but preferably a monoclonal antibody.

The polyclonal antibody may be produced by injecting a biomarker protein or a fragment thereof, as an immunogen, into a foreign host, according to a conventional method known to those skilled in the art. The foreign host includes mammals such as a mouse, a rat, a sheep, a rabbit, and the like. The immunogen is injected through intramuscular, intraperitoneal or subcutaneous injection, and is generally administered together with an adjuvant for improving antigenicity. From the foreign host, blood is periodically collected to collect blood serum showing improved titer and antigenic specificity, from which blood serum an antibody is separated and purified.

The monoclonal antibody may be produced by a technology for producing immortalized cell lines by fusion, known in the art [Koeher and Milstein 1975, Nature, 256:495)]. Hereinafter, the production method will be simply described. First, 20 μg of pure protein is obtained, and is immunized into a Balb/C rat. Otherwise, peptide is synthesized, bound to bovine serum albumin, and immunized into a rat. Then, antigen-producing lymphocyte separated from the rat is fused with myeloma of a human or a mouse to produce immortalized hybridoma. Then, ELISA method is used to select and proliferate only hybridoma cells producing a required monoclonal antibody, and the monoclonal antibody is separated and purified from that culture.

In order to accomplish a further object of the present invention, the present invention provides a method for diagnosing the degree of progression of diabetic nephropathy of a subject, the method including the step of detecting the biomarker protein or the immunogenic fragment thereof, according to the present invention, from a fluid of the subject. In the diagnosis method of the present invention, human blood is used. Also, in the detecting step, from a blood solution of the subject, the existence of the biomarker protein or the immunogenic fragment thereof are directly detected through two dimensional (2-D) electrophoresis. Otherwise, the blood can be contacted with the antibody of the present invention, to thereby indirectly detect the biomarker protein or the immunogenic fragment thereof through an antigen-antibody reaction.

Immunoassay methods, which are widely known to include antigen-antibody reactions, may include an enzyme immunoassay method (ELISA, Coated tube), a magnetic particle method (in which antibody-bound magnetic particles are bound to a tube, antigen-tracer and non-degradable pollutants are competitively reacted with each other to cause an enzyme reaction, and quantification is carried out), a latex particle method using antibody-bound latex particles, and the like. In another aspect of the present invention, the present invention provides a kit for diagnosing diabetic nephropathy, which includes, as an active component, an antibody specifically bound to the biomarker protein of the present invention or an immunogenic fragment thereof.

The diagnostic kit of the present invention is manufactured by a conventional manufacturing method known in the art, and typically includes freeze-dried antibody and buffer, stabilizer, inactive protein, and the like. The antibody may be labeled with a radioisotope, a fluorophore, an enzyme, or the like. The monoclonal antibody of the present invention may be variously used for an immunoassay kit (ELISA, antibody coated tube test, lateral-flow test, potable biosensor), and also may be used to develop a protein chip having a detection spectrum for various diabetic complications through development of an antibody showing higher specificity and sensitivity.

In accordance with another aspect of the present invention, the present invention provides a composition for treating and preventing IgA nephropathy or TGBM nephropathy, which includes, as an active component, protein selected from the group including proteins that show increased/decreased levels in urine of IgA nephropathy patients or TGBM nephropathy patients.

The pharmaceutical composition of the present invention may be prepared as a formulation such as a parenteral injection by mixing with a pharmaceutically acceptable carrier, an excipient, a diluent, etc. according to a method known in the pharmacological field, and then may be administered through intravenous injection, etc. The dose of the pharmaceutical composition according to the present invention may be appropriately selected depending on age, sex, severity, and disease symptoms of a patient, and preferably, 0.001 to 100 mg of protein per day per adult may be administered.

Advantageous Effects

The present invention can easily diagnose IgA nephropathy or TGBM nephropathy from urine. There has been no commercially available efficient diagnostic agent for diagnosing IgA nephropathy patients or TGBM nephropathy patients so far. The biomarker protein composition of the present invention is very advantageous in that it can simply diagnose IgA/TGBM nephropathy from urine of IgA nephropathy patients or TGBM nephropathy patients, and can diagnose diabetic nephropathy early and predict the degree of disease progression in advance.

Also, monoclonal antibodies prepared based on the biomarker proteins of the present invention can be used for an immunoassay kit (ELISA, antibody coated tube test, lateral-flow test, potable biosensor) capable of diagnosing IgA nephropathy and TGBM nephropathy early, and predicting the degree of disease progression. Furthermore, the antibody showing higher specificity and sensitivity can be used for developing a protein chip having a detection spectrum for early diagnosis and disease progression detection of IgA nephropathy and TGBM nephropathy from among various glomerular nephritis diseases.

BRIEF DESCRIPTION OF THE DRAWINGS

The foregoing and other objects, features and advantages of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings in which:

FIG. 1 shows electrophoresis photographs on the purity of separated exosomes, analyzed by western blot;

FIG. 2 is a flow chart showing a procedure for discovering a biomarker capable of diagnosing a disease from urine exosome; and

FIG. 3 shows western blot photographs of proteins according to the present invention that who increased/decreased levels in patients.

BEST MODE

Hereinafter, the present invention will be described in detail with reference to Examples. These Examples are intended to only illustrate the present invention, and are not intended to limit the scope of the present invention.

Example 1 Urinary Sample Preparation

All urine samples of patients and normal people were provided from Kyung-pook National University Hospital. From among urine samples collected from July 2006 to April 2008, urine samples of 5 IgA nephropathy patients and 7 TGBM nephropathy patients, which were confirmed through renal biopsy of the teenagers, and 12 normal people were selected. The first morning urine sample of each of the providers was collected, treated with protease inhibitor (1.67 ml of 100 mM NaN₃/2.5 ml of 10 mM PMSF/50 ul of 1 mM Leupeptin), and stored at −80° C. The urine sample was standardized with a urine creatinine level. The standardized urine sample [IgA nephropathy patients (IgAN): 88.1 ml, TGBM nephropathy patients (thinGBM): 65.2 ml] was used through a strong vortex action immediately after being dissolved, and clinicopathologic information of used urine is noted in Table 1.

TABLE 1 Clinicopathologic information on urine used for Example Urine protein Ucr Histological sex age (/dl) (/dl) classification IgA M 19 133 3423.0 Haas subclassII nephropathy F 18 80.5 1812.3 Haas subclassII F 16 83.3 3891.3 Haas subclassII M 19 31.8 4242.0 Haas subclassII M 19 30.4 3513.3 Haas subclassI M 19 40.9 5758.2 TGBM TGBM M 19 32.3 3916.5 TGBM nephropathy M 19 30.0 4512.9 TGBM M 19 43.6 5680.5 TGBM M 18 34.5 3528.0 TGBM M 18 28.8 2509.5 TGBM M 19 31.0 5817.0 TGBM

Example 2 Purification of Exosome

2-1. Purification of Exosome

The urine creatinine level of each urine sample was recognized by a body fluid analyzer. Then, urine samples of three groups were put together after their volumes were set in such a manner that the same creatinine level was included. The put-together urine sample was subjected to first centrifugation (17,000 g for 15 min at 4° C.) to remove fragments such as whole cells or large membrane proteins. The supernatant of the first centrifugation was subjected to second centrifugation (200,000×g for 1 h at 4° C.) to precipitate low-density membrane vesicle protein. The precipitated resultant product was resuspended by using 50 ul of isolation buffer (250 mM sucrose/10 mM triethanolamine/0.5 mM PMSF/1 μM leupeptin), transferred to 1.5 ml polypropylene tube, added with 60 mg/ml of DTT, and reacted at 60° C. for 10 minutes to separate THP. Then, the isolation buffer was added to carry out centrifugation (200,000 g for 1 h at 4° C.), and thereby low-density membrane vesicle protein was precipitated and separated.

2-2. Confirmation of Exosome Purity

In order to confirm the purity of separated exosome, three fractions below were obtained: {circle around (1)} urinary sediment (obtained by carrying out first centrifugation (17.000×g, 15 minutes) of 10 ml of urine); {circle around (2)} urinary exosome (sediment which is obtained by carrying out first centrifugation (17,000×g, 15 minutes) of 10 ml of urine to provide supernatant, and then carrying out second centrifugation (200,000×g, 1 hour) of the supernatant); and {circle around (3)} protein obtained by precipitating 10 ml of first centrifuged supernatant through the addition of the same amount of acetone thereto. The obtained fractions were loaded on 12% acrylamide gel, and subjected to electrophoresis. Protein of the gel was transferred to nitrocellulose membrane, and was subjected to western blot. The resultant product was subjected to blocking at room temperature for 1 hour in 5% non-skim milk dissolved in TBS-T (20 mM Tris, 500 mM NaCl, 0.05% Tween-20), added with 5% non-skim milk/TBS-T solution containing anti-AQP2 (aquapolin 2) (Santa Cruz, Calif., USA) as a marker protein of exosome, and anti-NHE3 (Na/H exchanger 3) (Chemicon, Temecula, Calif., USA) primary antibody, and reacted at 4° C. for 16 hours. Then, the resultant product was conjugated with a secondary antibody bound to horseradish peroxidase (Santa Cruz, Calif., USA) chemiluminescence (ECL, Amersham Pharmacia Biotech), and imaged by a sensing method. In order to confirm the separation purity of exosome, antibodies of two proteins (NHE3 and AQP2) as exosome marker proteins were used to carry out western blot on three fractions: {circle around (1)} urinary sediment (obtained by carrying out first centrifugation (17.000×g, 15 minutes) of 10 ml of urine); {circle around (2)} urinary exosome (sediment which is obtained by carrying out first centrifugation (17,000×g, 15 minutes) of 10 ml of urine to provide supernatant, and then carrying out second centrifugation (200,000×g, 1 hour) of the supernatant); and {circle around (3)} protein obtained by precipitating 10 ml of first centrifuged supernatant through the addition of the same amount of acetone thereto. The result is shown in FIG. 1 {(A) Rabbit anti-Na+/H+ exchanger-3 [NHE-3] polyclonal antibody (B) Mouse anti-Aquaporin-2 [AQP-2] monoclonal antibody. (1) urinary sediment (pellet after 17,000 g 15 min spin); (2) urinary exosome (pellet after 200,000 g 1 hr spin from supernatant of 17,000 g 15 min spin) (3) a 10 ml aliquot of 17,000 g supernatant was used to isolate urinary protein by acetone precipitation.}. In the second fraction, two proteins as exosome markers were expressed, while in other two fractions, they were not expressed.

Example 3 Enzyme Digestion

The obtained exosome sediment was suspended in 14 ul of 0.3% SDS solution, mixed with 5 ul of acrylamide solution (30%), 0.7 ul of 1% ammonium persulfate, and 0.3 ul of TEMED, and polymerized at room temperature for about 30 minutes. A small gel was cut into pieces with a size of 1 mm³ by a surgeon's knife, and washed with 25 mM of ABC buffer (pH 8.0) for 20 min and 25 mM of ABC (pH 8.0)/50% ACN buffer for 20 min. Then, the gel was dried by vacuum-drying, and subjected to a general in-gel digestion method. Each protein was added with 10 mM of DTT, reduced at 56° C. for 30 minutes, and then added with 55 mM of iodoacetamide (IAA), and alkylated by dark reaction at room temperature. Then, the gel pieces were washed with 25 mM of ABC (pH 8.0) buffer for 20 min and 25 mM of ABC (pH 8.0)/50% ACN buffer for 20 min, and dried by vacuum-drying. Trypsin was dissolved in 25 mM of ABC buffer to a concentration of 100 ng/ul, and reacted with gel pieces at 37° C. for 16 hours. Peptide cleaved by trypsin was extracted three times by using a solution of 25 mM ABC, 5% formic acid/25 mM ABC/50% ACN in water, and each extracted peptide solution was dried by vacuum-drying. Then, only peptide was collected by a solid-phase protein extracting method.

Example 4 Protein Identification

In nano-size liquid chromatography analysis, a nanoAcquity system (Waters Corporation, Milford, Mass.) was used, and herein, C18 trap column of 5 μm, 2 mm 180 μm (Symmetry), and C18 analyzing reversed-phase column of 1.7 μm, 25 cm×5 μm (BEH) (Waters Corporation) were used. The obtained peptide was analyzed by being dissolved in 0.1% formic acid. A mobile phase A (0.1% formic/water), and a mobile phase B (0.1% formic acid/CAN) were used. The phase was flowed into the trap column at a flow rate of 10 μL/min for 3 min. The mobile phase B was flowed at a concentration of 3 to 40% and a flow rate of 300 nl/min, for 360 min to separate peptide. The column was washed with 90% mobile phase B for 15 min, and then restabilized with 3% mobile phase B for 20 min. The temperature of the column was maintained at 35° C., and an auxiliary pump was used to move 100 fmol [Glu1]-Fibrinopeptide B/μL at a flow rate of 300 mL/min to a nano-lock reference spray of a mass spectrometer. All samples were repetitively carried out 4 times. The analysis of tryptic peptide was carried out by using Q-Tof Premier mass spectrometer (Waters Corporation, Manchester, UK). The mass spectrometer has a resolution of 10,000 FWHM in v-mode. All analyses were performed in a cation mode, and TOF analysis was carried out in a range of m/z 50˜1990. [Glu1]-Fibrinopeptide B having a divalent charge was used to compensate an in-real time mass value, once per 30 sec. In low collision energy mass spectrometry, data is collected for 1 sec at 4 eV, and in high collision energy spectrometry, data is collected for 1 sec by increasing energy from 15 eV to 40 eV. Between the low collision energy spectrometry and the high collision energy spectrometry, there is a time difference of 0.1 sec.

Example 5 Relative Quantification

The data obtained by liquid-phase chromatography mass spectrometer was analyzed by using ProteinLynx GlobalServer v2.3 (Waters Corporation) software. From the clustered and normalized data, protein was identified by using an algorithm of ProteinLynx GlobalServer v2.3, and then the accurate mass value of the identified result and the delay time of the liquid-phase chromatography were used for clustering. The peak intensity of identified tryptic peptide was used to calculate the amount of each protein, and then the calculated value was used to determine the expression of protein in each group.

Example 6 Biomarker Validation

From urine samples of 12 normal people, 5 IgA nephropathy patients, and 7 TGBM patients, exosomes were separated, and was subjected to western blot by using antibodies such as anti-Aminopeptidase N, anti-Vasorin precursor, anti-Ceruloplasmin, anti-Alpha-1-antitrypsin, to determine the expression extent of the protein in each group. The entire process for identifying a biomarker for diagnosing a disease from urinary exosome is shown in FIG. 2.

As a result of protein analysis in the above described Example, three repetitive tests through LC-MS/MS on a normal people group (a normal group) and two patient groups (IgAN group, and TGBM group) identified a total of 2059 proteins. Some of the proteins are noted in Tables 2 to 33.

TABLE 2 Increased/decreased proteins identified by Example Accession No. Description Score Unique Normal IgAN TGBM IPI:IPI00000073.1 EGF Pro-epidermal growth 1198.61 1.00 — 1.19 factor precursor IPI:IPI00247063.3 MME Neprilysin 1112.42 1.00 — 0.75 IPI:IPI00788190.1 EPS8L2 similar to epidermal 851.67 1.00 — 1.31 growth factor receptor pathway substrate 8-like protein 2 IPI:IPI00017601.1 CP Ceruloplasmin precursor 742.16 IgAN — IgAN_high — IPI:IPI00017367.6 RDX Radixin isoform b 728.13 1.00 — 0.89 IPI:IPI00022463.1 TF Serotransferrin precursor 711.44 IgAN — IgAN_high — IPI:IPI00798430.1 TF Transferrin variant (Fragment) 711.44 IgAN — IgAN_high — IPI:IPI00290337.7 EPS8 Uncharacterized 707.62 1.00 — 0.84 protein EPS8 IPI:IPI00008787.3 NAGLU Alpha-N- 691.64 Normal Normal_high — — acetylglucosaminidase precursor IPI:IPI00339269.1 HSPA6 Heat shock 70 kDa 690.55 1.00 — 1.30 protein 6 IPI:IPI00220327.3 KRT1 Keratin, type II 679.34 1.00 0.25 0.61 cytoskeletal 1 IPI:IPI00295988.4 PROM2 Prominin-2 669.97 1.00 — 1.27 IPI:IPI00246058.5 PDCD6IP PDCD6IP protein 669.19 1.00 0.11 1.06 IPI:IPI00871576.1 PDCD6IP Dopamine receptor 663.3 1.00 0.11 1.07 interacting protein 4 IPI:IPI00062047.5 KIF12 Kinesin-like protein KIF12 657.26 1.00 — 0.92

TABLE 3 Increased/decreased proteins identified by Example Accession No. Description Score Unique Normal IgAN TGBM IPI:IPI00004573.2 PIGR Polymeric 631.19 1.00 — 0.93 immunoglobulin receptor precursor IPI:IPI00555656.1 Huntingtin interacting protein-1- 621.62 1.00 — 2.16 related (Fragment) IPI:IPI00746033.1 NAGLU 47 kDa protein 618.94 1.00 — 1.55 IPI:IPI00018953.1 DPP4 Dipeptidyl peptidase 4 589.84 1.00 — 0.79 IPI:IPI00792032.1 ABCB1 P-glycoprotein 1 581.18 1.00 — 1.02 IPI:IPI00027481.1 ABCB1 Multidrug resistance 578.8 1.00 — 0.74 protein 1 IPI:IPI00003765.1 CAPN7 Calpain-7 547.66 1.00 — 1.05 IPI:IPI00177880.3 PROM2 CDNA FLJ34089 fis, 542.58 1.00 — 1.17 clone FCBBF3006249, moderately similar to Mus musculus prominin-like protein mRNA IPI:IPI00478530.1 KIF12 Kinesin family member 12 539.36 1.00 — 1.06 IPI:IPI00794184.1 CP 97 kDa protein 535.08 IgAN — IgAN_high — IPI:IPI00304925.5 HSPA1A:HSPA1B Heat 519.91 1.00 — 1.21 shock 70 kDa protein 1 IPI:IPI00847536.1 HSPA1A:HSPA1B heat shock 519.91 1.00 — 1.19 70 kDa protein 1B IPI:IPI00845339.1 HSPA1A:HSPA1B heat 519.91 1.00 — 1.15 shock 70 kDa protein 1A IPI:IPI00746183.2 UEVLD Isoform 1 of Ubiquitin- 515.73 1.00 — 0.92 conjugating enzyme E2 variant 3

TABLE 4 Increased/decreased proteins identified by Example Accession No. Description Score Unique Normal IgAN TGBM IPI:IPI00005578.1 EHD4 EH domain- 463.22 1.00 — 1.09 containing protein 4 IPI:IPI00465028.7 TPI1 Isoform 1 of 459.21 1.00 — 0.99 Triosephosphate isomerase IPI:IPI00785050.1 Putative uncharacterized 458.65 IgAN — IgAN_high — protein IPI:IPI00010418.4 MYO1C Myosin-Ic 455.53 1.00 — 0.48 IPI:IPI00216171.3 ENO2 Gamma-enolase 455 1.00 — 0.71 IPI:IPI00384697.2 ALB Isoform 2 of Serum 451.54 1.00 4.00 1.86 albumin precursor IPI:IPI00414315.8 EPS8L2 Isoform 1 of Epidermal 449.28 1.00 — 1.51 growth factor receptor kinase substrate 8-like protein 2 IPI:IPI00299088.3 BAIAP2 Isoform 1 of Brain- 449.07 1.00 — 3.00 specific angiogenesis inhibitor 1-associated protein 2 IPI:IPI00644120.1 BAIAP2 Isoform 2 of Brain- 449.07 1.00 — 2.77 specific angiogenesis inhibitor 1-associated protein 2 IPI:IPI00003269.1 DKFZp686D0972 hypothetical 447.24 1.00 — 1.09 protein LOC345651 IPI:IPI00553177.1 SERPINA1 Isoform 1 of 446.13 IgAN — IgAN_high — Alpha-1-antitrypsin precursor IPI:IPI00873444.1 RPS27A:UBC:UBB 79 kDa 443.55 1.00 0.20 0.83 protein IPI:IPI00854806.1 IGKV1-5 IGKV1-5 protein 443.17 — 1.00 0.64 IPI:IPI00218407.6 ALDOB Fructose- 442.98 1.00 — 1.30 bisphosphate aldolase B

TABLE 5 Increased/decreased proteins identified by Example Accession No. Description Score Unique Normal IgAN TGBM IPI:IPI00399007.5 IGHG2 Putative 441.69 — 1.00 0.43 uncharacterized protein DKFZp686I04196 (Fragment) IPI:IPI00644855.1 C1orf58 Chromosome 1 437.68 1.00 — 1.80 open reading frame 58 IPI:IPI00337415.9 GNAI1 Guanine 437.3 1.00 — 1.07 nucleotide-binding protein G(i), alpha-1 subunit IPI:IPI00798127.1 RPS27A; UBC; UBB 436.6 1.00 0.16 0.85 ubiquitin C IPI:IPI00790784.2 SERPINA1 Isoform 2 of 435.08 IgAN — IgAN_high — Alpha-1-antitrypsin precursor IPI:IPI00165579.6 CNDP2 PP856 433.91 1.00 — 1.13 IPI:IPI00642333.1 BAIAP2 Isoform 6 of 433.61 1.00 — 2.69 Brain-specific angiogenesis inhibitor 1-associated protein 2 IPI:IPI00185159.7 BAIAP2 Isoform 4 of 433.61 1.00 — 1.46 Brain-specific angiogenesis inhibitor 1-associated protein 2 IPI:IPI00441344.1 GLB1 Beta-galactosidase 433.01 1.00 — 0.77 precursor IPI:IPI00797646.3 GLB1 Beta-galactosidase 433.01 1.00 — 0.50 (Fragment) IPI:IPI00479743.3 POTE2 protein expressed in 432.29 1.00 — 1.21 prostate, ovary, testis, and placenta 2 IPI:IPI00180292.5 BAIAP2 Isoform 5 of 431.62 1.00 — 1.15 Brain-specific angiogenesis inhibitor 1-associated protein 2 IPI:IPI00785200.1 Putative uncharacterized 430.24 IgAN — IgAN_high — protein IPI:IPI00739539.5 LOC728378 Chimeric 428.33 1.00 — 1.28 POTE-actin protein

TABLE 6 Increased/decreased proteins identified by Example Accession No. Description Score Unique Normal IgAN TGBM IPI:IPI00004503.5 LAMP1 426.54 1.00 — 1.00 lysosomal-associated membrane protein 1 IPI:IPI00305457.5 SERPINA1 PRO2275 424.86 1.00 3.23 — IPI:IPI00647603.1 BAIAP2 Isoform 3 of 424.12 1.00 — 0.76 Brain-specific angiogenesis inhibitor 1-associated protein 2 IPI:IPI00219365.3 MSN Moesin 423.34 1.00 — 0.92 IPI:IPI00872814.1 MSN 68 kDa protein 423.34 1.00 — 0.88 IPI:IPI00217906.3 GNAI2 Isoform 2 of 421.08 1.00 — 0.97 Guanine nucleotide-binding protein G(i), alpha-2 subunit IPI:IPI00555945.1 IGL@ IGL@ protein 420.93 IgAN — IgAN_high — IPI:IPI00217342.8 UEVLD Isoform 2 of 420.53 1.00 — 0.95 Ubiquitin-conjugating enzyme E2 variant 3 IPI:IPI00027438.2 FLOT1 Flotillin-1 419.67 Normal Normal_high — — IPI:IPI00217717.2 GGT1 Isoform 2 of 419.38 1.00 — 0.69 Gamma-glutamyl transpeptidase 1 precursor IPI:IPI00646907.1 SLC12A3 solute carrier 418.98 1.00 — 0.64 family 12 (sodium/chloride transporters), member 3 IPI:IPI00216438.3 SLC12A3 Solute carrier 418.98 1.00 — 0.24 family 12 member 3 IPI:IPI00816555.1 IGLV2-14 IGLV2-14 418.93 IgAN — IgAN_high — protein IPI:IPI00719452.1 IGL@ IGL@ protein 415.4 IgAN — IgAN_high — IPI:IPI00007682.2 ATP6V1A Vacuolar ATP 415.25 Normal Normal_high — — synthase catalytic subunit A

TABLE 7 Increased/decreased proteins identified by Example Accession No. Description Score Unique Normal IgAN TGBM IPI:IPI00420088.1 KIAA0174 Isoform 2 of 415.06 1.00 0.14 1.46 Uncharacterized protein KIAA0174 IPI:IPI00829626.1 IGL@ IGL@ protein 414.97 IgAN — IgAN_high — IPI:IPI00218343.4 TUBA1C Tubulin 413.63 1.00 — 0.66 alpha-1C chain IPI:IPI00873229.1 UEVLD 42 kDa protein 412.57 1.00 — 1.02 IPI:IPI00382938.3 IGLV4-3 IGLV4-3 protein 411.54 IgAN — IgAN_high — IPI:IPI00003362.2 HSPA5 HSPA5 protein 410.4 TGBM — — TGBM_high IPI:IPI00024660.1 KIAA0174 Isoform 1 of 409.31 1.00 0.17 1.58 Uncharacterized protein KIAA0174 IPI:IPI00386516.3 KIAA0174 KIAA0174 409.31 1.00 0.16 1.57 protein IPI:IPI00550162.2 IGLV3-25 IGLV3-25 408.52 IgAN — IgAN_high — protein IPI:IPI00797510.1 GNAI2 35 kDa protein 408.48 1.00 — 1.01 IPI:IPI00798391.1 GNAI2 39 kDa protein 408.48 1.00 — 0.97 IPI:IPI00794986.1 GNAI2 408.48 1.00 — 0.95 WUGSC: H_LUCA15.1 protein IPI:IPI00025476.1 AMY1A; AMY1C; AMY2A; 407.93 1.00 — 4.06 AMY1B Pancreatic alpha-amylase precursor IPI:IPI00867501.1 TUBA1B similar to 407.67 1.00 — 0.79 Tubulin alpha-ubiquitous chain IPI:IPI00387144.4 TUBA1B Tubulin 407.67 1.00 — 0.77 alpha-1B chain IPI:IPI00792677.1 TUBA1B 46 kDa protein 407.67 1.00 — 0.56

TABLE 8 Increased/decreased proteins identified by Example Accession No. Description Score Unique Normal IgAN TGBM IPI:IPI00658130.1 IGL@ IGL@ protein 396.3 IgAN — IgAN_high — IPI:IPI00555577.1 THY 1 Thy-1 cell surface 395.31 1.00 — 0.60 antigen variant (Fragment) IPI:IPI00478908.3 TUBA1C 29 kDa protein 394.78 1.00 — 0.78 IPI:IPI00018434.1 TSG101 Isoform 1 of 394.12 1.00 — 0.76 Tumor susceptibility gene 101 protein IPI:IPI00718819.2 IGLC3; IGLV2-14; IGLC2; IGLC1; 394.07 IgAN — IgAN_high — IGL@ IGLV2-14 protein IPI:IPI00795257.1 GAPDH 32 kDa protein 393.43 1.00 — 0.85 IPI:IPI00807428.1 Putative uncharacterized 393.17 IgAN — IgAN_high — protein IPI:IPI00830047.1 Uncharacterized protein 391.69 IgAN — IgAN_high — ENSP00000374858 (Fragment) IPI:IPI00827875.1 Lambda-chain precursor 390.42 IgAN — IgAN_high — IPI:IPI00744476.6 IGL@ IGL@ protein 388.78 IgAN — IgAN_high — IPI:IPI00784935.1 Putative uncharacterized 388.78 IgAN — IgAN_high — protein IPI:IPI00789134.1 GAPDH Glyceraldehyde 388.29 1.00 — 0.96 3-phosphate dehydrogenase IPI:IPI00218414.5 CA2 Carbonic anhydrase 2 387.66 1.00 — 0.89 IPI:IPI00740545.1 LOC653269 similar to 387.64 1.00 — 0.79 Prostate, ovary, testis expressed protein on chromosome 2 isoform 2 IPI:IPI00218474.5 ENO3 Beta-enolase 386.68 1.00 — 3.63

TABLE 9 Increased/decreased proteins identified by Example Accession No. Description Score Unique Normal IgAN TGBM IPI:IPI00647012.1 HSPA1A; HSPA1B Heat 367.55 Normal Normal_high — — shock 70 kDa protein 1A IPI:IPI00473011.3 HBD; HBB Hemoglobin 366.74 — 1.00 4.85 subunit delta IPI:IPI00478003.1 A2M 364.04 IgAN — IgAN_high — Alpha-2-macroglobulin precursor IPI:IPI00441550.1 GLB1 362.89 1.00 — 0.57 Beta-galactosidase-related protein precursor IPI:IPI00022892.2 THY 1 Thy-1 membrane 361.81 1.00 — 0.59 glycoprotein precursor IPI:IPI00797221.3 GAPDH 360.95 1.00 — 0.84 Glyceraldehyde-3-phosphate dehydrogenase IPI:IPI00182728.2 VPS4B Vasculor protein 360.67 1.00 0.07 0.78 sorting-associating protein 4B IPI:IPI00289983.3 ACPP ACPP protein 358.26 Normal Normal_high — — IPI:IPI00384938.1 IGHG1 Putative 358.13 — 1.00 0.94 uncharacterized protein DKFZp686N02209 IPI:IPI00065500.3 C1orf58 BRO1 357.19 1.00 — 1.08 domain-containing protein BROX IPI:IPI00789376.1 KNG1 KNG1 protein 356.73 1.00 — 0.83 IPI:IPI00383071.1 LOC729708 355.76 1.00 — 0.86 Triosephosphate isomerase (Fragment) IPI:IPI00396434.1 ACPP Prostatic acid 354.4 Normal Normal_high — — phosphatase precursor IPI:IPI00423463.1 IGHG1 Putative 354.2 — 1.00 0.95 uncharacterized protein DKFZp686O01196

TABLE 10 Increased/decreased proteins identified by Example Accession No. Description Score Unique Normal IgAN TGBM IPI:IPI00787680.1 similar to Triosephosphate 353.67 1.00 — 0.97 isomerase (TIM) (Triose-phosphate isomerase) isoform 2 IPI:IPI00790896.1 GNB2 26 kDa protein 351.94 1.00 — 1.16 IPI:IPI00829944.1 IGHG1 IGHG1 protein 350.78 — 1.00 0.90 IPI:IPI00872379.1 ANXA5 36 kDa protein 350.57 1.00 — 0.59 IPI:IPI00329801.12 ANXA5 Annexin A5 350.57 1.00 — 0.58 IPI:IPI00829767.1 IGHG2 Uncharacterized 350.51 — 1.00 0.44 protein IGHG2 (Fragment) IPI:IPI00423466.1 IGHG1 Putative 348.53 1.00 4.76 4.31 uncharacterized protein DKFZp686H20196 IPI:IPI00790302.1 GNB2 28 kDa protein 347.94 1.00 — 1.19 IPI:IPI00011134.2 HSPA7 Putative heat 347.71 1.00 — 1.34 shock 70 kDa protein 7 IPI:IPI00796250.1 GNAI2 27 kDa protein 346.68 1.00 — 0.97 IPI:IPI00872328.1 HBB Beta-globin gene 345.5 — 1.00 4.84 from a thalassemia patient IPI:IPI00784817.1 Anti-RhD monoclonal 344.56 1.00 4.35 4.26 T125 gamma 1 heavy chain precursor IPI:IPI00761159.1 IGHM IGHM protein 343.37 1.00 4.76 4.06 IPI:IPI00807531.2 IGHG1 IGHG1 protein 342.47 — 1.00 0.79

TABLE 11 Increased/decreased proteinsidentified by Example Accession No. Description Score Unique Normal IgAN TGBM IPI:IPI00796636.8 HBB Hemoglobin 340.64 — 1.00 4.81 (Fragment) IPI:IPI00293088.4 GAA Uncharacterized 340.59 TGBM — — TGBM_high protein GAA IPI:IPI00398700.3 GNAO1 Guanine 340.2 1.00 — 1.05 nucleotide-binding protein G(o) subunit alpha 2 IPI:IPI00784828.1 Putative Uncharacterized 339.74 1.00 4.76 4.18 protein DKFZp686C11235 IPI:IPI00815926.1 IGHG1 IGHG1 protein 339.65 1.00 5.26 4.71 IPI:IPI00004101.4 BHMT 339.64 1.00 — 0.93 Betaine-homocysteine S-methyltransferase 1 IPI:IPI00513830.1 ALDOB 339.19 1.00 — 1.32 Fructose-bisphosphate aldolase IPI:IPI00024403.1 CPNE3 Copine-3 336.53 1.00 — 0.82 IPI:IPI00448925.3 IGHG1 IGHG1 protein 336.47 — 1.00 0.90 IPI:IPI00743241.1 RPS27A; UBC; UBB 44 kDa 335.03 1.00 0.19 0.84 protein IPI:IPI00743650.1 RPS27A; UBC; UBB 44 kDa 335.03 1.00 0.18 0.84 protein IPI:IPI00784810.1 IGHV4-31 protein 333.43 1.00 4.17 3.74 IPI:IPI00465248.5 ENO1 Isoform 333.4 1.00 — 0.79 alpha-enolase of Alpha-enolase IPI:IPI00744274.1 RPS27A; UBC; UBB 44 kDa 332.81 1.00 0.19 0.83 protein IPI:IPI00645363.2 IGHG1 Putative 332.5 — 1.00 0.93 uncharacterized protein DKFZp686P15220

TABLE 12 Increased/decreased proteins identified by Example Accession No. Description Score Unique Normal IgAN TGBM IPI:IPI00423464.1 IGHG1 Putative 332.27 — 1.00 0.90 uncharacterized protein DKFZp686K03196 IPI:IPI00448938.1 IGHG1 IGHG1 protein 332.07 — 1.00 0.90 IPI:IPI00013769.1 Alpha-enolase, lung 330.56 1.00 — 1.36 specific IPI:IPI00784822.1 IGHV4-31 IGHV4-31 330.18 — 1.00 0.90 protein IPI:IPI00335421.4 FIGNL1 Isoform 1 of 330.14 1.00 — 0.78 Fidgetin-like protein 1 IPI:IPI00221224.6 ANPEP Aminopeptidase N 328.19 1.00 0.05 0.65 IPI:IPI00784842.1 IGHV4-31 Putative 327.93 — 1.00 0.91 uncharacterized protein DKFZp686G11190 IPI:IPI00792712.1 RPS27A; UBC; UBB 39 kDa 327.63 1.00 0.19 0.84 protein IPI:IPI00009030.1 LAMP2 Isoform LAMP-2A 327.49 Normal Normal_high — — of Lysosome-associated membrane glycoprotein 2 precursor IPI:IPI00216172.2 LAMP2 327.49 Normal Normal_high — — Lysosomal-associated membrane protein 2C IPI:IPI00739827.1 LAMP2 Isoform LAMP-2B 327.49 Normal Normal_high — — of Lysosome-associated membrane glycoprotein 2 precursor IPI:IPI00816681.1 IGHM Hepatitis B virus 322.91 1.00 5.00 4.44 receptor binding protein (Fragment) IPI:IPI00220281.3 GNAO1 Guanine 322.25 1.00 — 1.11 nucleotide-binding protein G(o) subunit alpha 1

TABLE 13 Increased/decreased proteins identified by Example Accession No. Description Score Unique Normal IgAN TGBM IPI:IPI00794035.1 GNAI2 20 kDa protein 311.97 1.00 — 1.00 IPI:IPI00795746.1 GNAI2 19 kDa protein 311.97 1.00 — 0.95 IPI:IPI00400826.1 CLU clusterin isoform 1 311.5 TGBM — — TGBM_high IPI:IPI00418813.2 CDNA FLJ46113 fis, clone 311.25 1.00 0.18 0.72 TESTI2036285, highly similar to Rattus norvegicus ubiquitin C IPI:IPI00785079.1 Putative Uncharacterized 310.01 IgAN — IgAN_high — protein IPI:IPI00784589.1 Putative Uncharacterized 309.1 IgAN — IgAN_high — protein DKFZp781M0386 IPI:IPI00829640.1 IGL@ IGL@ protein 309.01 IgAN — IgAN_high — IPI:IPI00855706.1 FIGNL1 Isoform 2 of 307.57 1.00 — 0.68 Fidgetin-like protein 1 IPI:IPI00784711.1 Putative Uncharacterized 307.48 IgAN — IgAN_high — protein IPI:IPI00031821.1 ITM2B Integral membrane 306.68 1.00 — 0.64 protein 2B IPI:IPI00719373.1 IGL@ IGL@ protein 306.35 IgAN — IgAN_high — IPI:IPI00479186.5 PKM2 Isoform M2 of 303.28 TGBM — — TGBM_high Pyruvate kinase isozymes M1/M2 IPI:IPI00789902.1 GPRC5C G protein-coupled 302.78 1.00 0.12 1.36 receptorr family C, group 5, member C isoform b

TABLE 14 Increased/decreased proteins identified by Example Accession No. Description Score Unique Normal IgAN TGBM IPI:IPI00719280.2 RPS27A; UBC; UBB 290.53 1.00 0.19 0.84 ubiquitin B precursor IPI:IPI00798155.3 RPS27A; UBC; UBB 290.53 1.00 0.18 0.82 Ubiquitin C splice variant IPI:IPI00423461.3 IGHA2 Putative 290.26 1.00 0.99 1.39 uncharacterized protein DKFZp686C02220 (Fragment) IPI:IPI00852577.1 IGLC1 protein 289.84 IgAN — IgAN_high — IPI:IPI00847989.1 PKM2 Pyruvate kinase 289.12 1.00 — 1.43 (Fragment) IPI:IPI00791026.1 MYO1C 56 kDa protein 289.07 1.00 — 0.81 IPI:IPI00180675.4 TUBA1A Tubulin 285.54 1.00 — 0.75 alpha-1A chain IPI:IPI00794663.1 TUBA4A 48 kDa protein 284.61 Normal Normal_high — — IPI:IPI00007750.1 TUBA4A Tubulin 284.61 Normal Normal_high — — alpha-4A chain IPI:IPI00790633.1 RPS27A; UBC; UBB 25 kDa 282.66 1.00 0.19 0.83 protein IPI:IPI00646909.2 TUBA8 Tubulin alpha-8 282.44 Normal Normal_high — — chain IPI:IPI00787871.1 LOC729708 similar to 281.63 1.00 — 0.84 Triosephosphate isomerase (TIM) (Triose-phosphate isomerase) isoform 1 IPI:IPI00007221.1 SERPINA5 Plasma serine 280.84 1.00 — 0.67 protease inhibitor precursor

TABLE 15 Increased/decreased proteins identified by Example Accession No. Description Score Unique Normal IgAN TGBM IPI:IPI00642117.4 GNB1 Beta-subunit signal 280.41 1.00 — 1.13 transducing proteins GS/GI IPI:IPI00793953.1 TUBA8 Putative 280.05 Normal Normal_high — — uncharacterized protein DKFZp686L04275 (Fragment) IPI:IPI00787104.1 similar to Triosephosphate 279.54 1.00 — 0.84 isomerase (TIM) (Triose-phosphate isomerase) isoform 1 IPI:IPI00827694.1 UEVLD Isoform 4 of 279.48 1.00 — 0.99 Ubiquitin-conjugating enzyme E2 variant 3 IPI:IPI00031065.1 DNASE1 279.47 TGBM — — TGBM_high Deoxyribonuclease-1 precursor IPI:IPI00794925.1 RPS27A; UBC; UBB 21 kDa 279.06 1.00 0.19 0.82 protein IPI:IPI00295414.7 COL15A1 Collagen 278.78 1.00 — 1.99 alpha-1 (XV) chain precursor IPI:IPI00795527.1 RPS27A; UBC; UBB 21 kDa 278.08 1.00 0.19 0.81 protein IPI:IPI00737216.1 LOC652899 similar to 277.03 1.00 — 3.67 Salivary alpha-amylase precursor IPI:IPI00797969.1 GNB2 17 kDa protein 275.94 1.00 — 1.11 IPI:IPI00291928.8 RAB14 Ras-related protein 275.03 1.00 — 1.11 Rab-14 IPI:IPI00792478.1 TUBA8 43 kDa protein 274.85 Normal Normal_high — — IPI:IPI00639998.1 GNB1 Guanine nuclotide 274.52 1.00 — 1.15 binding protein (G protein), beta polypeptide 1

TABLE 16 Increased/decreased proteins identified by Example Accession No. Description Score Unique Normal IgAN TGBM IPI:IPI00657660.1 HBB Hemoglobin 273.87 — 1.00 4.62 delta-beta fusion protein IPI:IPI00829877.1 IGL@ IGL@ protein 272.78 IgAN — IgAN_high — IPI:IPI00095891.2 GNAS Isoform XLas-1 of 271.41 TGBM — — TGBM_high Guanine nucleotide-binding protein G(s) subunit alpha isoforms XLas IPI:IPI00556204.1 Eukaryotic translation 270.05 1.00 — 3.35 elongation factor 1 alpha 2 variant (Fragment) IPI:IPI00218164.1 MUC1 Isoform 3 of 269.65 — 1.00 8.85 Mucin-1 precursor IPI:IPI00788932.1 GNAL Guanine nucleotide 269.18 TGBM — — TGBM_high binding protein IPI:IPI00796600.1 RPS27A; UBC; UBB 18 kDa 267.56 1.00 0.19 0.83 protein IPI:IPI00867545.1 MUC1 isoform M6 267.43 1.00 — 0.75 IPI:IPI00793810.1 RPS27A; UBC; UBB 19 kDa 266.84 1.00 0.19 0.82 protein IPI:IPI00796007.1 RPS27A; UBC; UBB 17 kDa 264.75 1.00 0.19 0.84 protein IPI:IPI00797400.1 RPS27A; UBC; UBB 19 kDa 264.75 1.00 0.19 0.81 protein IPI:IPI00794211.1 RPS27A; UBC; UBB 18 kDa 264.75 1.00 0.19 0.80 protein IPI:IPI00830113.2 HBB 19 kDa protein 264.14 — 1.00 5.26 IPI:IPI00789823.1 RPS27A; UBC; UBB 16 kDa 263.36 1.00 0.19 0.82 protein IPI:IPI00640949.1 GNB1 Guanine nucleotide 263.01 1.00 — 1.20 binding protein (G protein), beta polypeptide 1

TABLE 17 Increased/decreased proteins identified by Example Accession No. Description Score Unique Normal IgAN TGBM IPI:IPI00640462.1 GNB1 Guanine nucleotide 261.63 1.00 — 1.13 binding protein (G protein), beta polypeptide 1 IPI:IPI00784990.2 RPS27A; UBC; UBB 261.51 1.00 0.19 0.84 Ubiquitin C splice variant IPI:IPI00012451.3 GNB4 Guanine 260.68 1.00 — 1.13 nucleotide-binding protein subunit beta-4 IPI:IPI00645255.1 GDI2 GDP dissociation 260.03 Normal Normal_high — — inhibitor 2 IPI:IPI00218163.1 MUC1 Isoform 2 of 257.97 — 1.00 8.58 Mucin-1 precursor IPI:IPI00218165.1 MUC1 Isoform 4 of 257.97 — 1.00 8.33 Mucin-1 precursor IPI:IPI00013955.1 MUC1 Isoform 1 of 257.97 — 1.00 8.33 Mucin-1 precursor IPI:IPI00607844.1 MUC1 Mucin 1, cell 257.97 1.00 0.10 0.92 surface associated IPI:IPI00829896.1 HBD Hemoglobin 255.62 — 1.00 4.71 Lepore-Baltimore (Fragment) IPI:IPI00816229.1 ACTA2 ACTA2 protein 255.2 1.00 0.15 1.26 (Fragment) IPI:IPI00291866.5 SERPING1 Plasma 252.16 1.00 — 1.97 protease C1 inhibitor precursor

TABLE 18 Increased/decreased proteins identified by Example Accession No. Description Score Unique Normal IgAN TGBM IPI:IPI00556287.1 Putative Uncharacterized 250.96 — 1.00 0.79 protein IPI:IPI00793848.1 CLU 54 kDa protein 249.02 TGBM — — TGBM_high IPI:IPI00794488.1 GNAI2 12 kDa protein 248.73 1.00 — 0.80 IPI:IPI00013945.1 UMOD Isoform 1 of 248.09 1.00 0.76 1.34 Uromodulin precursor IPI:IPI00640271.1 UMOD 74 kDa protein 248.09 1.00 0.74 1.34 IPI:IPI00032561.1 CAB39 Calcium-binding 247.93 Normal Normal_high — — protein 39 IPI:IPI00793330.1 RPS27A; UBC; UBB 12 kDa 247.23 1.00 0.17 0.82 protein IPI:IPI00456429.3 UBA52 ubiquitin and 246.39 1.00 0.19 0.81 ribosomal protein L40 precursor IPI:IPI00759806.1 ENO1 Isoform MBP-1 of 246.28 1.00 — 1.46 Alpha-enolase IPI:IPI00008964.3 RAB1B Ras-related 245.38 1.00 — 0.71 protein Rab-1B IPI:IPI00300562.2 RAB3B Ras-related 245.02 1.00 — 0.99 protein Rab-3B IPI:IPI00737338.1 UMOD Isoform 2 of 244.98 1.00 0.88 1.21 Uromodulin precursor IPI:IPI00744076.1 UMOD Isoform 3 of 244.45 1.00 0.82 1.35 Uromodulin precursor IPI:IPI00179330.6 RPS27A; UBC; UBB 244.41 1.00 0.19 0.82 ubiquitin and ribosomal protein S27a precursor

TABLE 19 Increased/decreased proteins identified by Example Accession No. Description Score Unique Normal IgAN TGBM IPI:IPI00795461.1 CAPN7 18 kDa protein 243.8 1.00 — 0.73 IPI:IPI00646415.1 RAB14 20 kDa protein 243.75 1.00 — 0.98 IPI:IPI00654754.1 RPS27A; UBC; UBB 243.53 1.00 0.20 0.93 RPS27A protein IPI:IPI00556549.1 SERPING1 Serine/cysteine 243.4 1.00 — 1.92 proteinase inhibitor clade G member 1 splice variant 2 (Fragment) IPI:IPI00395488.2 VASN Vasorin precursor 242.49 1.00 — 3.49 IPI:IPI00008603.1 ACTA2 Actin, aortic 240.99 1.00 0.08 1.26 smooth muscle IPI:IPI00792139.1 RPS27A; UBC; UBB 9 kDa 240.24 1.00 0.18 0.93 protein IPI:IPI00646491.2 GNAS Isoform XLas-2 of 239.84 TGBM — — TGBM_high Guanine nucleotide-binding protein G(s) subunit alpha isoforms XLas IPI:IPI00004416.1 CHMP2A Charged 239.77 1.00 — 0.95 multivesicular body protein 2a IPI:IPI00478874.1 SDCBP syntenin isoform 2 239.64 1.00 0.08 0.95 IPI:IPI00869217.1 LOC645367 Similar to 238.89 1.00 — 0.64 Gamma-glutamyltranspeptidase 1 precursor (EC 2.3.2.2) (Gammaglutamyltransferase 1) (CD224 antigen) [Contains: Gammaglutamyltranspeptidase 1 heavy chain; Gamma-glutamyltranspeptidase 1 light chain]. Isoform 2

TABLE 20 Increased/decreased proteins identified by Example Accession No. Description Score Unique Normal IgAN TGBM IPI:IPI00607569.1 MUC1 mucin 1 isoform 2 238.62 1.00 0.14 1.23 precursor IPI:IPI00607673.2 MUC1 MUC1 isoform 238.62 1.00 0.13 1.19 Z-LSP IPI:IPI00385173.2 MUC1 mucin 1 isoform 3 238.62 1.00 0.13 1.14 precursor IPI:IPI00218170.1 MUC1 Isoform 8 of 238.62 1.00 0.11 0.96 Mucin-1 precursor IPI:IPI00218169.1 MUC1 Isoform 7 of 238.62 1.00 0.11 0.95 Mucin-1 precursor IPI:IPI00873004.1 UBA52 11 kDa protein 237.63 1.00 0.20 0.93 IPI:IPI00382606.1 F7 Factor VII active site 236.89 IgAN — IgAN_high — mutant immunoconjugate IPI:IPI00657915.1 EHD1 41 kDa protein 236.83 Normal Normal_high — — IPI:IPI00216791.2 SLC12A1 SLC12A1 protein 236.5 1.00 — 1.12 IPI:IPI00745461.1 VASN Uncharacterized 235.47 1.00 — 3.29 protein VASN IPI:IPI00419932.4 RAB12 Putative 235.04 1.00 — 1.55 Ras-related protein Rab-12 IPI:IPI00025416.3 ACTG2 Actin, 234.71 1.00 0.08 1.26 gamma-enteric smooth muscle IPI:IPI00218168.1 MUC1 Isoform 6 of 232.19 1.00 0.10 0.90 Mucin-1 precursor IPI:IPI00299086.3 SDCBP Syntenin-1 231.69 1.00 0.12 0.60

TABLE 21 Increased/decreased proteins identified by Example Accession No. Description Score Unique Normal IgAN TGBM IPI:IPI00640867.1 GNAS GNAS complex 231.25 TGBM — — TGBM_high locus isoform f IPI:IPI00514055.1 GNAS Isoform Gnas-1 of 231.25 TGBM — — TGBM_high Guanine nucleotide-binding protein G(s) subunit alpha isoforms short IPI:IPI00738905.1 LOC648749 similar to 231.03 1.00 — 2.53 Pancreatic alpha-amylase precursor IPI:IPI00006662.1 APOD Apolipoprotein D 230.36 Normal Normal_high — — precursor IPI:IPI00479018.2 SDCBP Syntenin isoform 3 230.17 1.00 0.11 0.59 IPI:IPI00021263.3 YWHAZ 14-3-3 protein 229.9 1.00 — 0.81 zeta/delta IPI:IPI00789337.1 YWHAZ Tyrosine 229.85 1.00 — 1.07 3-monooxygenasea/tryptophan 5-monooxygenase activation protein zeta IPI:IPI00852677.1 MUC1 isoform T11 229.03 1.00 0.11 0.99 IPI:IPI00855927.1 MUC1 MUC1 isoform M8 229.03 1.00 0.11 0.96 IPI:IPI00335314.3 TUBA4A Uncharacterized 228.05 Normal Normal_high — — protein TUBA4A IPI:IPI00025277.5 PCDC6 Programmed cell 227.45 1.00 — 0.80 death protein 6 IPI:IPI00166768.3 TUBA1C TUBA1C protein 226.01 1.00 — 0.58 IPI:IPI00027223.2 IDH1 Isocitrate 225.71 1.00 — 1.09 dehydrogenase [NADP] cytoplasmic

TABLE 22 Increased/decreased proteins identified by Example Accession No. Description Score Unique Normal IgAN TGBM IPI:IPI00215997.5 CD9 CD9 antigen 224.74 TGBM — — TGBM_high IPI:IPI00012113.1 UPK2 Uroplakin-2 224.61 1.00 — 1.17 precursor IPI:IPI00027452.1 SLC2A5 Solute carrier 224.45 1.00 — 1.19 family 2, facilitated glucose transporter member 5 IPI:IPI00016513.5 RAB10 Ras-related protein 233.88 1.00 — 0.70 Rab-10 IPI:IPI00305551.3 GNA11 Guanine 223.85 1.00 — 0.99 nucleotide-binding protein subunit alpha-11 IPI:IPI00023006.1 ACTC1 Actin, alpha 223.06 1.00 0.08 1.26 cardiac muscle 1 IPI:IPI00414057.3 ACTA1 Actin alpha 1 222.53 1.00 — 1.68 skeletal muscle protein IPI:IPI00017454.3 TUBA4B Tubulin alpha-4 221.89 Normal Normal_high — — chain IPI:IPI00219826.1 TSG101 Isoform 2 of 220.24 1.00 — 0.89 Tumor susceptibility gene 101 protein IPI:IPI00555900.1 FKSG30 Kappa-actin 219.71 1.00 — 1.11 IPI:IPI00028481.1 RAB8A Ras-related 219.6 1.00 — 0.67 protein Rab-8A IPI:IPI00000695.1 GNA14 Guanine 218.41 Normal Normal_high — — nucleotide-binding protein alpha-14 subunit IPI:IPI00794699.1 SDCBP 27 kDa protein 218.29 1.00 0.11 0.60 IPI:IPI00100796.4 CHMP5 Charged 216.38 1.00 — 2.32 multivesicular body protein 5

TABLE 23 Increased/decreased proteins identified by Example Accession No. Description Score Unique Normal IgAN TGBM IPI:IPI00869052.1 Similar to Elongation 216.09 1.00 — 0.41 factor 1-alpha 1 IPI:IPI00021428.1 ACTA1 Actin, alpha 214.37 1.00 0.08 1.23 skeletal muscle IPI:IPI00786945.1 LOC727848 similar to 214.32 TGBM — — TGBM_high actin-like protein IPI:IPI00871597.1 MASP2 21 kDa protein 209.96 1.00 — 1.68 IPI:IPI00000816.1 YWHAE 14-3-3 protein 208.64 Normal Normal_high — — epsilon IPI:IPI00646265.1 AMY1A; AMY1C; AMY2A; 208.1 1.00 — 2.56 AMY1B Amylase, alpha 1B IPI:IPI00795937.1 CD9 15 kDa protein 207.74 1.00 — 1.60 IPI:IPI00014363.1 BHMT2 207.13 1.00 — 1.46 Betaine-homocysteine S-methyltransferase 2 IPI:IPI00306378.5 MASP2 Isoform 2 of 207.1 1.00 — 1.46 Mannan-binding lectin serine protease 2 precursor IPI:IPI00791558.1 HBB Delta-hemoglobin 207.04 — 1.00 4.53 IPI:IPI00790892.1 ENO2 6 kDa protein 206.95 1.00 — 0.68 IPI:IPI00871366.1 RAB1B Small GTP-binding 206.62 1.00 — 0.66 protein IPI:IPI00006395.1 GNAL Guanine 206.29 TGBM — — TGBM_high nucleotide-binding protein G(olf) subunit alpha IPI:IPI00032808.1 RAB3D Ras-related protein 206.09 1.00 — 0.98 Rab-3D IPI:IPI00073180.8 RAB37 Ras-related protein 204.67 TGBM — — TGBM_high Rab-37

TABLE 24 Increased/decreased proteins identified by Example Accession No. Description Score Unique Normal IgAN TGBM IPI:IPI00025447.8 EEF1A1 Elongation factor 198.97 1.00 — 2.53 1-alpha IPI:IPI00472724.1 Elongation factor 1-alpha 197.03 1.00 — 4.62 IPI:IPI00185072.10 UEVLD Isoform 5 of 195.5 Normal Normal_high — — Ubiquitin-conjugating enzyme E2 variant 3 IPI:IPI00791608.1 HSPA8 20 kDa protein 195.26 1.00 — 0.57 IPI:IPI00748022.1 P704P similar to 195.04 TGBM — — TGBM_high actin-like protein IPI:IPI00869004.1 SERPINA1 Isoform 3 of 194.98 IgAN — IgAN_high — Alpha-1-antitrypsin precursor IPI:IPI00793344.1 YWHAE 22 kDa protein 194.66 Normal Normal_high — — IPI:IPI00382804.1 EEF1A1 EEF1A protein 194.36 1.00 — 3.60 (Fragment) IPI:IPI00793922.1 GAPDH 9 kDa protein 192.47 1.00 — 0.69 IPI:IPI00410714.5 HBA2; HBA1 Hemoglobin 192.32 — 1.00 6.62 subunit alpha IPI:IPI00853068.1 HBA2; HBA1 Alpha 2 192.32 — 1.00 6.75 globin variant (Fragment) IPI:IPI00798392.1 RAB37 26 kDa protein 190.35 TGBM — — TGBM_high IPI:IPI00396485.3 EEF1A1 Elongation factor 190.04 1.00 — 1.23 1-alpha 1 IPI:IPI00016373.3 RAB13 Ras-related 189.36 1.00 — 0.73 protein Rab-13 IPI:IPI00794523.2 ACTG1; PSPHL ACTG1 188.69 1.00 0.12 1.20 protein

TABLE 25 Increased/decreased proteins identified by Example Accession No. Description Score Unique Normal IgAN TGBM IPI:IPI00646632.3 CNDP2 28 kDa protein 187.84 1.00 — 1.00 IPI:IPI00022134.1 RAB1B Putative small 187.19 1.00 — 0.72 GTP-binding protein IPI:IPI00791421.1 RAB37 21 kDa protein 186.39 TGBM — — TGBM_high IPI:IPI00552303.3 ANXA11 Annexin A11 185.44 1.00 — 3.53 IPI:IPI00795002.1 TUBA1C 19 kDa protein 185.04 1.00 — 0.76 IPI:IPI00515047.2 ACTA1 Actin, alpha 1, 184.34 1.00 0.09 1.34 skeletal muscle IPI:IPI00010896.3 CLIC1 Chloride 184.31 1.00 — 0.84 intracellular channel protein 1 IPI:IPI00023673.1 LGALS3BP 183.02 1.00 0.15 0.38 Galectin-3-binding protein precursor IPI:IPI00413344.3 CFL2 Cofilin-2 181.25 Normal Normal_high — — IPI:IPI00790499.1 RAB37 21 kDa protein 180.41 TGBM — — TGBM_high IPI:IPI00419585.9 PPIA; PPIAL3; LOC654188 179.82 Normal Normal_high — — Peptidyl-prolyl cis-trans isomerase A IPI:IPI00785140.2 Uncharacterized protein 179.04 1.00 — 0.92 ENSP00000330714 IPI:IPI00180730.1 Elongation factor 1-alpha 178.55 Normal Normal_high — — IPI:IPI00329441.1 ISY1; RAB43 Ras-related 177.34 1.00 — 0.90 protein Rab-43

TABLE 26 Increased/decreased proteins identified by Example Accession No. Description Score Unique Normal IgAN TGBM IPI:IPI00736860.2 ELK2, member of ETS 177.21 1.00 2.86 2.46 oncogene family, pseudogene 1 IPI:IPI00645370.1 VPS4B 16 kDa protein 177.1 1.00 0.13 0.88 IPI:IPI00002926.4 VPS37B Vacuolar protein 176.93 1.00 — 1.08 sorting-associated protein 37B IPI:IPI00477489.1 RAB4B Isoform 1 of 176.87 TGBM — — TGBM_high Ras-related protein Rab-4B IPI:IPI00012540.1 PROM1 Prominin-1 176.63 1.00 0.19 0.99 precursor IPI:IPI00745705.2 LOC730924 similar to 175.5 1.00 — 2.46 Pancreatic alpha-amylase precursor IPI:IPI00788782.1 ATP1A3 175.36 1.00 1.09 — Cation-transporting ATPase IPI:IPI00302840.2 ATP1A3 175.36 1.00 0.03 — Sodium/potassium-transporting ATPase subunit alpha-3 IPI:IPI00430842.3 IGHA1 IGHA1 protein 175.11 1.00 0.97 1.45 IPI:IPI00798247.1 HSPA8 20 kDa protein 174.84 1.00 — 1.45 IPI:IPI00060801.1 RAB39B Ras-related 173.59 TGBM — — TGBM_high protein Rab-39B IPI:IPI00014424.1 EEF1A2 Elongation factor 172.45 1.00 — 4.10 1-alpha 2 IPI:IPI00844239.1 Immunoblobulin G1 Fab 172.25 — 1.00 1.05 heavy chain variable region (Fragment) IPI:IPI00218918.5 ANXA1 Annexin A1 170.07 Normal Normal_high — —

TABLE 27 Increased/decreased proteins identified by Example Accession No. Description Score Unique Normal IgAN TGBM IPI:IPI00246975.8 GSTM3 Glutathione 160.98 Normal Normal_high — — S-transferase Mu 3 IPI:IPI00015148.3 RAP1B Ras-related 159.81 1.00 0.36 1.32 protein Rap-1b precursor IPI:IPI00845493.1 Brain type mu-glutathione 159.72 Normal Normal_high — — S-transferase IPI:IPI00872974.1 GSTA2 Glutathione 158.01 1.00 — 0.77 S-transferase IPI:IPI00169383.3 PGK1 Phosphoglycerate 157.34 1.00 — 0.55 kinase 1 IPI:IPI00005719.1 RAB1A Isoform 1 of 156.04 1.00 — 0.70 Ras-related protein Rab-1A IPI:IPI00787396.1 GNAT3 similar to Guanine 154.41 TGBM — — TGBM_high nucleotide-binding protein G(t), alpha-3 subunit IPI:IPI00797556.1 ANXA2 24 kDa protein 153.1 Normal Normal_high — — IPI:IPI00019345.1 RAP1A Ras-related 152.92 1.00 0.36 1.35 protein Rap-1A precursor IPI:IPI00796467.1 TF 11 kDa protein 152.91 — 1.00 0.44 IPI:IPI00023510.1 RAB5A Ras-related 152.53 TGBM — — TGBM_high protein Rab-5A IPI:IPI00657682.2 GSTA1 Glutathione 151.68 1.00 — 0.71 S-transferase A1 IPI:IPI00783387.1 Immunglobulin heavy 150.22 1.00 1.06 — chain variable region (Fragment)

TABLE 28 Increased/decreased proteins identified by Example Accession No. Description Score Unique Normal IgAN TGBM IPI:IPI00022977.1 CKB Creatine kinase 407.27 1.00 — 0.73 B-type IPI:IPI00219018.7 GAPDH 407.22 1.00 — 0.84 Glyceraldehyde-3-phosphate dehydrogenase IPI:IPI00472610.2 IGHM IGHM protein 406.9 1.00 5.26 4.85 IPI:IPI00411356.5 VPS4A Vacuolar protein 406.68 1.00 — 0.83 sorting-associating protein 4A IPI:IPI00440160.2 UEVLD Isoform 3 of 406.44 1.00 — 1.00 Ubiquitin-conjugating enzyme E2 variant 3 IPI:IPI00154742.6 IGL@ IGL@ protein 406.41 IgAN — IgAN_high — IPI:IPI00021447.1 AMY2B Alpha-amylase 405.88 1.00 — 3.71 2B precursor IPI:IPI00784519.1 Putative uncharacterized 405.02 IgAN — IgAN_high — protein IPI:IPI00450309.1 IGL@ IGL@ protein 404.64 IgAN — IgAN_high — IPI:IPI00796167.1 IGL@ IGL@ protein 404.12 IgAN — IgAN_high — IPI:IPI00217269.3 GNAT2 Guanine 403.37 1.00 — 1.13 nucleotide-binding protein G(t) subunit alpha-2 IPI:IPI00032328.2 KNG1 Isoform HMW of 401.91 1.00 — 0.78 Kininogen-1 precursor IPI:IPI00003348.3 GNB2 Guanine 398.88 1.00 — 1.17 nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-2 IPI:IPI00000885.1 FRK Tyrosine-protein 398.32 1.00 — 0.73 kinase FRK IPI:IPI00785196.1 Putative uncharacterized 398.06 IgAN — IgAN_high — protein

TABLE 29 Increased/decreased proteins identified by Example Accession No. Description Score Unique Normal IgAN TGBM IPI:IPI00657796.1 CD9 Uncharacterized 204.5 1.00 — 1.90 protein CD9 IPI:IPI00063827.1 ABHD14B Isoform 1 of 204.45 1.00 — 0.73 Abhydrolase domain-containing protein 14B IPI:IPI00644936.1 GNAS Isoform 3 of 204.01 TGBM — — TGBM_high Guanine nucleotide-binding protein G(s) subunit alpha isoforms short IPI:IPI00024282.1 RAB8B Ras-related 203.65 1.00 — 0.69 protein Rab-8B IPI:IPI00514530.4 ACTA1 Uncharacterized 202.61 1.00 0.09 1.25 protein ACTA1 IPI:IPI00480056.7 RAB4A Uncharacterized 202.54 1.00 — 1.07 protein RAB4A IPI:IPI00103065.4 MITD1 MIT 201.63 Normal Normal_high — — domain-containing protein 1 IPI:IPI00061114.1 RAB3C Ras-related 200.34 1.00 — 0.91 protein Rab-3C IPI:IPI00871276.1 RAB3C 26 kDa protein 200.34 1.00 — 0.90 IPI:IPI00219835.1 GNAS Isoform Gnas-2 of 200.12 TGBM — — TGBM_high Guanine nucleotide-binding protein G(s) subunit alpha isoforms short IPI:IPI00641459.3 EEF1A1 Similar to 199.31 1.00 — 0.43 Elongation factor 1 alpha IPI:IPI00377081.1 STOM stomatin isoform b 199.14 1.00 — 0.68

TABLE 30 Increased/decreased proteins identified by Example Accession No. Description Score Unique Normal IgAN TGBM IPI:IPI00745660.2 IGL@ IGL@ protein 302.18 IgAN — IgAN_high — IPI:IPI00294713.4 MASP2 Isoform 1 of 300.93 1.00 — 1.49 Mannan-binding lectin serine protease 2 precursor IPI:IPI00022255.1 OLFM4 Olfactomedin-4 300.3 1.00 0.07 1.86 precursor IPI:IPI00784627.1 Putative Uncharacterized 300.12 IgAN — IgAN_high — protein IPI:IPI00784713.1 Putative Uncharacterized 300.12 IgAN — IgAN_high — protein IPI:IPI00871793.1 MASP2 77 kDa protein 299.96 1.00 — 2.69 IPI:IPI00790490.1 GPRC5C 48 kDa protein 295.74 1.00 0.12 1.39 IPI:IPI00099883.4 GPRC5C G-protein 295.74 1.00 0.12 1.36 coupled receptor family C group 5 member C precursor IPI:IPI00291262.3 CLU Clusterin precursor 295.66 TGBM — — TGBM_high IPI:IPI00795633.1 CLU CLU 295.66 TGBM — — TGBM_high IPI:IPI00789107.1 RPS27A; UBC; UBB 30 kDa 294.28 1.00 0.19 0.83 protein IPI:IPI00784983.1 Putative Uncharacterized 293.91 IgAN — IgAN_high — protein IPI:IPI00026268.3 GNB1 Guanine 292.14 1.00 — 1.14 nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1 IPI:IPI00791613.1 TUBA8 52 kDa protein 291.34 Normal Normal_high — —

TABLE 31 Increased/decreased proteins identified by Example Accession No. Description Score Unique Normal IgAN TGBM IPI:IPI00465380.6 GNAS Uncharacterized 168.01 1.00 — 0.69 protein GNAS (Fragment) IPI:IPI00797951.1 HSPA8 16 kDa protein 166.78 1.00 — 1.43 IPI:IPI00788210.1 LOC728590 similar to 166.62 1.00 — 0.59 ribosomal protein S27a IPI:IPI00792992.1 RAB37 22 kDa protein 166.16 TGBM — — TGBM_high IPI:IPI00550181.2 CHMP2B Charged 166.07 1.00 — 1.28 multivesicular body protein 2b IPI:IPI00023504.1 RAB3A Ras-related 165.51 TGBM — — TGBM_high protein Rab-3A IPI:IPI00556414.1 Mel transforming 165.16 1.00 — 0.75 oncogene variant (Fragment) IPI:IPI00412525.1 hCG_1757335; RAP1B 164.4 1.00 0.41 1.28 Uncharacterized protein ENSP00000345280 IPI:IPI00220301.5 PRDX6 Peroxiredoxin-6 163.55 1.00 — 0.58 IPI:IPI00477090.6 IGHM IGHM protein 163.16 IgAN — IgAN_high — IPI:IPI00873902.1 RAB1A 23 kDa protein 162.44 1.00 — 0.67 IPI:IPI00187143.1 RAB4B Isoform 2 of 162.37 TGBM — — TGBM_high Ras-related protein Rab-4B IPI:IPI00854833.1 RAP1A Uncharacterized 161.39 1.00 — 1.63 protein RAP1A

TABLE 32 Increased/decreased proteins identified by Example Accession No. Description Score Unique Normal IgAN TGBM IPI:IPI00797482.1 RPS27A; UBC; UBB CDNA 386.38 1.00 0.19 0.83 FLJ32377 fis, clone SKMUS1000014, highly similar to Polyubiquitin 9 IPI:IPI00788737.1 GAPDH 39 kDa protein 384.98 1.00 — 0.89 IPI:IPI00643007.1 KIAA0174 Isoform 3 of 383.66 1.00 0.17 1.67 Uncharacterized protein KIAA0174 IPI:IPI00797523.1 HSPA8 20 kDa protein 383.66 1.00 — 0.71 IPI:IPI00397808.3 LOC388720 similar to 382.66 1.00 — 0.81 ubiquitin and ribosomal protein S27a precursor IPI:IPI00215894.1 KNG1 Isoform LMW of 382.13 1.00 — 0.81 Kininogen-1 precursor IPI:IPI00797833.3 KNG1 Kininogen 1 382.13 1.00 — 0.78 IPI:IPI00796633.1 TPI1 22 kDa protein 381.1 1.00 — 0.94 IPI:IPI00016339.4 RAB5C Ras-related 380.62 1.00 — 1.12 protein Rab-5C IPI:IPI00017160.3 VTA1 Vacuolar protein 378.92 1.00 — 0.79 sorting-associated protein VTA1 homolog IPI:IPI00642632.1 C7 protein 376.2 IgAN — IgAN_high — IPI:IPI00300786.1 AMY1A; AMY1C; AMY2A; 375.66 1.00 — 2.80 AMY1B Alpha-amylase 1 precursor IPI:IPI00793930.1 TUBA1B TUBA1B protein 375.65 1.00 — 1.01 IPI:IPI00816314.1 IGHM Putative 375.23 1.00 5.00 4.66 uncharacterized protein DKFZp686I15196 IPI:IPI00018901.2 GGT1 Isoform 1 of 369.2 1.00 — 0.62 Gamma-glutamyltranspeptidase 1 precursor

TABLE 33 Increased/decreased proteins identified by Example Accession No. Description Score Unique Normal IgAN TGBM IPI:IPI00396108.2 GPRC5C G 321.89 1.00 0.11 1.39 protein-coupled receptor family C, group 5, member C isoform a IPI:IPI00785164.1 Putative Uncharacterized 321.63 IgAN — IgAN_high — protein IPI:IPI00788054.1 GGT2 similar to 321.37 1.00 — 0.58 Gamma-glutamyltranspeptidase 1 precursor (Gamma-glutamyltransferase 1) (CD224 antigen) isoform 2 IPI:IPI00607626.1 FLOT1 Flotillin 1 321.32 Normal Normal_high — — IPI:IPI00785084.1 Immunoglobulin heavy 321.29 — 1.00 0.91 variable 4-31 IPI: IPI00301277.1 HSPA1L Heat shock 70 319.05 1.00 — 1.36 kDa protein 1L IPI: IPI00643152.1 HSPA1L Heat shock 319.05 1.00 — 1.20 70 kDa protein 1-like variant IPI:IPI00218488.3 GNAT1 Guanine 318.67 1.00 — 1.13 nucleotide-binding protein G(t) subunit alpha-1 IPI:IPI00815938.1 IGLV3-21 IGLV3-21 316.8 IgAN — IgAN_high — protein IPI:IPI00745360.1 GGT2 Uncharacterized 316.54 1.00 — 0.64 protein ENSP00000255845 IPI:IPI00829711.1 IGHA2 Uncharacterized 314.86 1.00 0.84 1.13 protein IGHA2 (Fragment) IPI:IPI00793729.1 RPS27A; UBC; UBB UBC 314.72 1.00 0.19 0.82 protein IPI:IPI00248911.7 GNAT3 guanine nucleotide 313.56 1.00 — 1.12 binding protein, alpha transducing 3 IPI:IPI00004901.5 GPRC5C CDNA FLJ20242 313.55 1.00 0.14 1.32 fis, clone COLF6369

In the present invention, from among proteins increased/decreased in IgA nephropathy patients and TGBM nephropathy patients, Aminopeptidase N, Vasorin precursor, Ceruloplasmin, and Alpha-1-antitrypsin were selected and subjected to western blot. The result is shown in FIG. 3 (Normal: normal people, IgAN: IgA nephropathy patients, TGBM: TGBM nephropathy patients).

INDUSTRIAL APPLICABILITY

Although several exemplary embodiments of the present invention have been described for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. 

The invention claimed is:
 1. A method of detecting IgA nephropathy in a patient suspected of having IgA nephropathy using urine exosome from said patient comprising: obtaining a urine sample from said patient; separating exosome from said urine sample; performing an immunoassay on said urine exosome comprising reacting said urine exosome with isolated monoclonal or polyclonal antibodies specifically binding to at least three different proteins selected from the group consisting of Ceruloplasmin precursor having Accession No. IPI00017601.1, Alpha-1-antitrypsin precursor having Accession No. IPI00553177.1, Serotransferrin precursor having Accession No. IPI00022463.1, Transferrin variant Fragment having Accession No. IPI00798430.1, and Alpha-2-macroglobulin precursor having Accession No. IPI00478003.1 to obtain at least three different specifically bound antibody-protein complexes; measuring levels of said at least three different specifically bound antibody-protein complexes to determine expression levels of said at least three different proteins in said urine exosome; detecting whether said urine exosome contains increased levels of said at least three different proteins by comparing said expression levels of said at least three different proteins in said urine exosome to levels of said at least three different proteins in urine exosome samples from healthy patients; and diagnosing that said patient has IgA nephropathy if said patient's urine exosome contains significantly higher levels of said at least three different proteins compared to said levels of said at least three different proteins in urine exosome samples from healthy patients.
 2. The method of claim 1, wherein said isolated monoclonal or polyclonal antibodies are said anti-Ceruloplasmin, said anti-Transferrin variant Fragment, and said anti-Alpha-2-macroglobulin precursor. 